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preview.js
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preview.js
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import actionTypes from '../actionTypes';
import nextState from './nextState';
/**
* Reducer for actions that modify the state of the preview model
*
* @param {Object|undefined} state before action
* @param {Object} action Redux action that modified state.
* Must have `type` property.
* @return {Object} state after action
*/
export default function preview( state, action ) {
if ( state === undefined ) {
state = {
enabled: {},
activeLink: undefined,
previewType: undefined,
measures: undefined,
activeToken: '',
shouldShow: false,
isUserDwelling: false,
wasClicked: false
};
}
switch ( action.type ) {
case actionTypes.BOOT:
return nextState( state, {
enabled: action.initiallyEnabled
} );
case actionTypes.REGISTER_SETTING:
return nextState( state, {
enabled: Object.assign( {}, state.enabled, {
[ action.name ]: action.enabled
} )
} );
case actionTypes.SETTINGS_CHANGE: {
return nextState( state, {
enabled: action.newValue
} );
}
case actionTypes.LINK_DWELL:
if ( action.el !== state.activeLink ) {
// New interaction
return nextState( state, {
activeLink: action.el,
previewType: action.previewType,
measures: action.measures,
activeToken: action.token,
// When the user dwells on a link with their keyboard, a preview is
// renderered, and then dwells on another link, the ABANDON_END
// action will be ignored.
//
// Ensure that all the preview is hidden.
shouldShow: false,
isUserDwelling: true,
promise: action.promise
} );
}
// Dwelling back into the same link.
return nextState( state, {
isUserDwelling: true
} );
case actionTypes.FETCH_ABORTED:
case actionTypes.ABANDON_END:
if ( action.token === state.activeToken && !state.isUserDwelling ) {
return nextState( state, {
activeLink: undefined,
previewType: undefined,
activeToken: undefined,
measures: undefined,
fetchResponse: undefined,
shouldShow: false
} );
}
return state;
case actionTypes.PREVIEW_DWELL:
return nextState( state, {
isUserDwelling: true
} );
case actionTypes.ABANDON_START:
return nextState( state, {
isUserDwelling: false,
wasClicked: false
} );
case actionTypes.FETCH_START:
return nextState( state, {
fetchResponse: undefined,
promise: action.promise
} );
case actionTypes.FETCH_COMPLETE:
if ( action.token === state.activeToken ) {
return nextState( state, {
fetchResponse: action.result,
shouldShow: state.isUserDwelling
} );
} // else fall through
default:
return state;
}
}

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